Letter To The Editor: Malibu Moon Is Second-Most Prolific Sire Of Kentucky Three-Day Event Starters

[Wandering Eyes]

About a year ago, RRP executive director Kirsten Green mused about a future in which we might see a headline such as “Leading sire X has prolific influence on track and beyond, produces record number of 5* starters.” A year later, that's almost exactly the headline I just got to write, which is thrilling as a fan of both racing and equestrian sport: the late Malibu Moon, inarguably an influential sire of Thoroughbred racehorses, is also leaving a lasting impact on equestrian sport.

Malibu Moon's three starters are contesting the Cosequin Lexington CCI4*-S: in lay terms, this is the second highest level of competition available in the sport of eventing, easiest described as an equestrian triathlon. Horse and rider combinations first perform a dressage test, in which accuracy of prescribed maneuvers and quality of movement are paramount. Next, they compete cross-country, a grueling test of stamina and courage as horses thunder over miles of undulating terrain and footing, navigating over large solid fence. In the final phase, combinations tackle a show jumping course in an arena, a challenge of accurate footwork and nimbleness.

Out of a total of 12 full Thoroughbreds entered in the 4*, Malibu Moon has sired a quarter of them. As of press time, there are 66 horses entered in total in the 4* (this number will drop in coming weeks: riders may only compete on two horses, so some have made multiple entries in advance to finalize later). Therefore, Malibu Moon has sired 4.5% of the entire 4* field.

For context, only one other stallion has sired more entries, and we had to go across both the 5* and 4* divisions to find him: Diarado, a Holstein warmblood stallion approved across multiple breed registries, recognized worldwide as a top sire of horses in multiple arenas. In 2024, Diarado was recognized for the third year in a row as the top sire for the sport of eventing by the World Breeding Federation for Sport Horses. Diarado is represented in the 5* by three offspring, and in the 4* by one.

Yeah, you read that correctly: the only stallion to sire more Kentucky Three-Day starters across both levels than Malibu Moon is literally the top ranking stallion in the world for that job.

And yet as I scroll through social media and racing publications, I see… nothing. What Malibu Moon has achieved here, albeit perhaps somewhat by accident, is a remarkable achievement in equestrian sport.

One could argue, reasonably, that equestrian sport simply isn't on the radar of the racing industry. And siring a string of horses who are competitive at the upper levels of a challenging sport completely separate from racing doesn't do much for a stallion's rankings in the Thoroughbred sire lists, nor improve the commercial appeal of his offspring. One could even argue that flaunting success in a totally different sport than racing might lessen a stallion's appeal as a sire of potential racehorses.

Malibu Moon | Sarah Andrew

But this achievement doesn't diminish a bit of Malibu Moon's legacy–if anything, it enhances it. It paves the way for the Thoroughbred industry to celebrate everything it's doing right in producing athletes.

Because this is not a coincidence: these three Malibu Moons didn't just happen to end up here, contesting one of the highest levels of what is viewed as one of the most physically demanding horse sports, after they already had racing careers. Horses don't get to the 4* level by chance: they are in rigorous physical and mental training to handle the pressure of this kind of competition. Any breeder or stallion owner should be proud to have a horse reach this level.

Looking back at Kirsten's article from last year, as much as I'm thrilled to be celebrating the achievements of Thoroughbreds in sport, I am reminded how much work we still have to do. We've certainly showcased the athleticism and trainability of the Thoroughbred in careers beyond racing through our work at the Retired Racehorse Project, but the next step looks clear: we as an industry need to better measure the impact of the breed in equestrian sport.

While researching the bloodlines of the Kentucky Three-Day entrants, it became apparent that most, if not all, of the horses entered do have some amount of Thoroughbred blood in their pedigrees. But when a Thoroughbred is bred to a warmblood, the resulting foal is considered a warmblood, and the Thoroughbred's contributions–the stamina, speed, and heart–are generally overlooked. Thoroughbred ancestors are not always identified by breed in a horse's pedigree as recorded by the International Federation for Equestrian Sports (FEI).

The same is true in the American Quarter Horse Association, which generally sets the standard for the majority of western sport disciplines: Thoroughbreds are a viable outcross, but those foals are considered Appendix Quarter horses–and can “earn” their way into becoming full Quarter horses via competitive performance, which further erases the Thoroughbred influence. The AQHA recently announced its own free pedigree service, in which the Thoroughbreds in a Quarter horse's pedigree are only subtly identified via the last two digits of their year of birth–not their breed. (To its credit, AQHA did acknowledge our suggestion that Thoroughbreds be better identified in this pedigree service.)

While the goal of the Thoroughbred industry is not necessarily to breed sport horses, with all the unique trappings of individual disciplines within that sport horse industry, the Thoroughbred industry does generally pride itself on breeding athletes. It's high time that we honor the achievements of Thoroughbreds in spaces other than racing.

In no other aspect of the horse industry will you find animals intentionally and carefully bred and produced for one specific job so often transitioning with relative ease to another, vastly different from that original purpose–let alone to the upper levels of those new sports. Isn't that worth celebrating?

The Retired Racehorse Project is following the progress of the total of 16 Thoroughbreds entered in the 5* and 4* divisions at the Defender Kentucky Three-Day Event on April 24-27. Learn more about the Thoroughbred entrants on the RRP's website.

–Kristen Kovatch Bentley, the Retired Racehorse Project

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